Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
- Autores
- Cellone, Sergio Aldo; Romero, Gustavo Esteban
- Año de publicación
- 2023
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability.
Instituto Argentino de Radioastronomía
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Ciencias Astronómicas
Galaxies
Active galaxies
BL Lacertae objects
Quasars - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/152611
Ver los metadatos del registro completo
id |
SEDICI_6adf5ad01ead52d8aacdca493df7c41b |
---|---|
oai_identifier_str |
oai:sedici.unlp.edu.ar:10915/152611 |
network_acronym_str |
SEDICI |
repository_id_str |
1329 |
network_name_str |
SEDICI (UNLP) |
spelling |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164Cellone, Sergio AldoRomero, Gustavo EstebanCiencias AstronómicasGalaxiesActive galaxiesBL Lacertae objectsQuasarsWe present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability.Instituto Argentino de RadioastronomíaFacultad de Ciencias Astronómicas y Geofísicas2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/152611enginfo:eu-repo/semantics/altIdentifier/issn/1538-4365info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4365/acb059info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:39:32Zoai:sedici.unlp.edu.ar:10915/152611Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:39:32.53SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
title |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
spellingShingle |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 Cellone, Sergio Aldo Ciencias Astronómicas Galaxies Active galaxies BL Lacertae objects Quasars |
title_short |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
title_full |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
title_fullStr |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
title_full_unstemmed |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
title_sort |
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 |
dc.creator.none.fl_str_mv |
Cellone, Sergio Aldo Romero, Gustavo Esteban |
author |
Cellone, Sergio Aldo |
author_facet |
Cellone, Sergio Aldo Romero, Gustavo Esteban |
author_role |
author |
author2 |
Romero, Gustavo Esteban |
author2_role |
author |
dc.subject.none.fl_str_mv |
Ciencias Astronómicas Galaxies Active galaxies BL Lacertae objects Quasars |
topic |
Ciencias Astronómicas Galaxies Active galaxies BL Lacertae objects Quasars |
dc.description.none.fl_txt_mv |
We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability. Instituto Argentino de Radioastronomía Facultad de Ciencias Astronómicas y Geofísicas |
description |
We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/152611 |
url |
http://sedici.unlp.edu.ar/handle/10915/152611 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/1538-4365 info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4365/acb059 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:SEDICI (UNLP) instname:Universidad Nacional de La Plata instacron:UNLP |
reponame_str |
SEDICI (UNLP) |
collection |
SEDICI (UNLP) |
instname_str |
Universidad Nacional de La Plata |
instacron_str |
UNLP |
institution |
UNLP |
repository.name.fl_str_mv |
SEDICI (UNLP) - Universidad Nacional de La Plata |
repository.mail.fl_str_mv |
alira@sedici.unlp.edu.ar |
_version_ |
1844616268971245568 |
score |
13.070432 |